Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7f190c70ce20eb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 18:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d834f98e052d039015c65c876819ff03 SHA-1: fac3090679b194c51afe4bfd91821497cfe52214 SHA-256: 1e7f190c70ce20eb7bc6701c19d993961cb86d45d91d19dae839cdce9c5e4eaf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying it as a link farm on disposable hosting. This suggests the primary purpose is to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://duef.ru/public/file/33017391236.pdf In PDF document text
    • http://hankyunget.net/userData/board/file/522122237.pdfIn PDF document text
    • http://handgun.ee/media/file/nelopuxukobitasebekozet.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/21251678215.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/gokesa.pdfIn PDF document text
    • http://hijoin.hu/editor_up/4255217288.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/42161901443.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/fularadewukakuwepo.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/tixatebenipitekonexe.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/riwovifogotixunapid.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/xidafexavejo.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/9418978804.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/zevitunev.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7d6c9dd25---pafamel.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fd78181d79664cf55d22e5ec2311647d/92768998776.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/88469892211.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/pominowosif.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/gogareno.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/17855538685.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/67545514182.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/10737913448.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/lamijakaxiwi.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/87837787834.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/luvapulotokubuf.pdfIn PDF document text
    • https://rais.bg/uploads/file/4574583116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=super+mario+crossover+3PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 17524 bytes
SHA-256: 269f95b839f852833bef58b0e488ba4432cafc2d723191681268f20dc9105d1e
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 10700 bytes
SHA-256: 4ae44cee78f85b0fcbd468c98b464989118c19f14aab62e4dd0141580b1f988e